The diagram below shows various stages involved in the production of beer.

Contained in the illustration is information pertaining to the procedure of brewing

beer

. From an observational perspective, it is apparent that the system is fairly complex which commences with the production of and culminates with a completed product ready for purchase. The initial phase focuses on preparing the liquid mixture that will become

beer

. The procedure begins with grains which are milled, mashed with water and

then

lautered, after which the spent grain is fed to livestock. The ensuing stage involves a boiler which heats the liquid

while

simultaneously hops and sugar are added.

Following

this

step, the mixture is whirled and cooled in preparation for fermentation. Preparing the

beer

for consumption is the focus of the latter steps in the sequence. Once cooling has been completed, the liquid moves on to the fermenter where yeast and CO2 are added.

This

is

then

left to mature. In the penultimate juncture, the now-fermented

beer

is filtered and

subsequently

packaged in barrels or bottles. The whole process terminates with the

beer

shipment where it is distributed to wholesalers